Solid State Theory
to be a ected by quantum e ects, as EPlanck = c2 r ~c G ˘1019GeV; lPlanck = r ~G c3 ˘1:6 10 35m; (3) where G= 6:673 10 11m3kg 1s 2 is the gravitational constant. This is the realm of the GUT (grand uni ed theory) and string theory. The goal is not to provide a better description of electrons or atomic cores, but to nd the most fundamental ...
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Introduction to String Theory - ETH Z
edu.itp.phys.ethz.chIntroduction to String Theory Chapter 0 ETH Zurich, HS13 Prof. N. Beisert, Dr. J. Br odel 22.12.2013 0 Overview String theory is an attempt to quantise gravity and unite it with the other fundamental forces of nature. It combines many interesting topics of (quantum) eld theory in two and higher dimensions.
Solid State Theory
edu.itp.phys.ethz.chLength: Bohr radius a B = ~2=me2 ˇ0:5 10 10m Energy: Hartree e2=a B = me4=~2 = mc2 2 ˇ27eV = 2Ry with the ne structure constant = e2=~c= 1=137.The energy scale of one Hartree is much less than the (relativistic) rest mass of an electron (˘0:5MeV), which in turn is considered small
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